Antiprism

Local-first · Zero backend · Privacy-preserving

The open workspace for scientific writing

A coherent set of local-first, open-source tools for LaTeX and Typst: real-time collaboration, in-browser compilation, and an optional AI assistant—no server, no API keys.

Create a projectOpen dashboard

No sign-in required. Works offline after initial asset and model caching.

What you get

One workspace with the same goal: write better, together, with privacy and control over your documents.

Real-time collaboration

Peer-to-peer sync via WebRTC and Yjs (CRDT). Work together without a central server. No relay—connections are direct.

Open dashboard
Sync
main.tex · 2 peers connected
you↔peer
Cursors in sync · no server
Shared files
main.texrefs.bibfig/

AI assistant (local)

Runs in-browser with WebGPU. No API keys, no data leaves your device. Ask questions or use Agent mode to generate LaTeX.

Open dashboard
AskAgent
Add methods section
\section{Methods} \begin{itemize} \item Survey (n=120) \item Interviews \item Thematic analysis \end{itemize}
What about citations?
Use \cite{key} and \bibliography{refs} in your .tex.
Ask about your document…

LaTeX compilation

BusyTeX and texlyre in WASM — compile locally, no cloud compiler. Supports XeLaTeX, LuaLaTeX, and pdfTeX.

Open dashboard
main.texrefs.bib
\documentclass{article}
\begin{document}
\section{Introduction}
Lorem ipsum dolor sit
amet, consectetur.
\section{Methods}
We used a mixed-methods
approach.
\section{Results}
Data shows significant
effects (p < .05).
\end{document}
PDF
Ln 12, Col 4·UTF-8·LaTeX

Typst compilation

Official compiler via typst.ts — full Typst support in the browser. Same split view and live preview as LaTeX.

Open dashboard
main.typlib.typ
#set document(...)
= Introduction
Lorem ipsum dolor sit
amet, consectetur.
= Methods
We used a mixed-methods
approach.
= Results
Data shows significant
effects.
PDF
Ln 8, Col 2·UTF-8·Typst

Local-first storage

IndexedDB-backed project filesystem. Your files stay on your device. Open projects from the dashboard anytime.

Open dashboard
Projects
Search projects…
  • Paper draft.tex
  • Thesis ch.2.tex
  • Notes.tex
  • Draft v2.tex
  • Appendix.tex
  • Lit review.tex
  • Slides.tex
+ New project

Export & import

Download projects as ZIP, or import from ZIP or folder. Take your work with you or restore from backup.

Open dashboard
Export / Import
project.zip
↔
folder
main.texrefs.bibfig/style.sty
Include
No cloud · full project copy

Antiprism at a glance

Antiprism is built on a simple idea: scientific writing deserves tools that are private, fast, and work where you do—without locking you into a cloud or a single device.

Privacy

Your source, assets, and compiled PDFs stay on-device. Collaboration is direct, not relayed through a central server.

Offline-first

After caching assets and models, you can write and compile without a network connection. Everything runs on your machine.

Fast iteration

Compile locally, zoom smoothly, and keep working on flaky Wi‑Fi or while traveling. No cloud dependency.

Open formats

LaTeX, Typst, and standard tooling. Your project is plain files—no lock-in and no proprietary formats to export.

One workspace, no backend

No server to run, no API keys to manage. Compile in the browser, collaborate over WebRTC, and keep your data on your device.

  • •Compile LaTeX and Typst in WASM, locally
  • •Real-time sync via peer-to-peer (WebRTC + Yjs)
  • •Optional in-browser AI with WebGPU

Ready to try it?

Create a project and start writing. No account required.

Create a projectBack to dashboard